Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Chapter 9, Problem 9.6P
To determine
The counter operating satisfactorily
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Students have asked these similar questions
Question 1. There are four factors: A, B, C, D. We assume that each replicate was considered as a block.
Fill in the table as below and analyze the experiment with conclusions. Using a = 0.05.
Treatment
combination Rep 1
Rep 2
7.786 | 7.377014
6.789 | 6.398278
5.834 5.554411
A
C
D
-1
a
-
b
2.341
2.28354
6.133 5.702366
3.669 | 3.608621
d
ab
ас
6.154
5.87312
ad
5.819| 5.550515
bc
12.887
12.62869
2.753 2.261361
4.451 4.411148
0.873 | 0.793026
4.678 | 4.259536
3.728 3.695787
bd
cd
abc
abd
bcd
аcd
10.478
10.33168
abcd
1.722 | 1.365419
Table 1
If the dose rate from a sample of Ra-223 was
found to be 5.0 x 10-5 mSv per hour at
1.8 metres, calculate the dose rate at 4.8
metres. Show your calculations. Give your
answer to two significant figures.
A Geiger counter measures 750 counts in 5.0 min. How long would you want to count to get a relative error of 1%?
Chapter 9 Solutions
Introduction To Health Physics
Ch. 9 - Prob. 9.1PCh. 9 - Prob. 9.2PCh. 9 - Prob. 9.3PCh. 9 - Prob. 9.4PCh. 9 - Prob. 9.5PCh. 9 - Prob. 9.6PCh. 9 - Prob. 9.7PCh. 9 - Prob. 9.8PCh. 9 - Prob. 9.9PCh. 9 - Prob. 9.10P
Ch. 9 - Prob. 9.11PCh. 9 - Prob. 9.12PCh. 9 - Prob. 9.13PCh. 9 - A counting system has a background of 360 counts...Ch. 9 - Prob. 9.15PCh. 9 - Prob. 9.16PCh. 9 - Prob. 9.17PCh. 9 - Prob. 9.18PCh. 9 - Prob. 9.19PCh. 9 - Prob. 9.20PCh. 9 - Prob. 9.21PCh. 9 - Prob. 9.22PCh. 9 - Prob. 9.23PCh. 9 - Prob. 9.24PCh. 9 - Prob. 9.25PCh. 9 - Prob. 9.26PCh. 9 - Prob. 9.27PCh. 9 - Prob. 9.28PCh. 9 - Prob. 9.29PCh. 9 - Prob. 9.31PCh. 9 - Prob. 9.33PCh. 9 - Prob. 9.34PCh. 9 - Prob. 9.35PCh. 9 - Prob. 9.38PCh. 9 - Prob. 9.39PCh. 9 - Prob. 9.44P
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- the mass m, is given the equation m=i[0.69]t. i is the intitial dose and t is the number of hours since the dose. Suppose the patient is given inital dose of 200mg. When will the amount of ibuprofen in the bloodstream be reduced by a factor of one half. round your answer to the nearest tenth of an hourarrow_forwardThe cell-survival data in the table below fit a multitarget, single-hit survival curve. A)Find the slope at high doses. B) Find the extrapolation number. C) Write the equation that describes the data. Dose (Gy) Surviving Fraction 0.10 0.993 0.25 0.933 0.50 0.729 1.00 0.329 2.00 0.0458 3.00 0.00578 4.00 0.00072 Paragraph BIEEarrow_forwardA radioactive sample is analyzed to give a total of 4000 counts; background gives 250. How many counts were detected with one standard deviation?arrow_forward
- A worker will need to conduct a repair to a pipe containing radioactive waste. The pipe is 10 m long, and the worker will need to be standing 50 cm from the pipe. A remote detector was used to take a reading of 1.5 R/hr at 3 m from the pipe. a) What is the dose rate at the work position? b) If the worker's dose limit is 30 rad, how long will he have to complete the work? Assume that there is no dose from approaching and leaving the work location.arrow_forwardA radiographic technique calls for 46 kVp and 28 mAs which results in an exposure of 278 µGy. What is the expected exposure if the technique is changed to 75 kVp and 14 mAs? Round your answer to the nearest whole number. Do not include units.arrow_forwardFrom the average of these values, determine the maximum number of hours you could work with this material in a year if the annual maximum permissible dose is 2.4 mSv and you count with 200 working days in a yeararrow_forward
- the V•O2max of people tends to declineafter age 30 by about 9% per decade for sedentary individuals,but it declines less than 5% per decade for people who stay active.The average V•O2max in healthy 30-year-olds is about 3.1 L/min.Using the information given here, what would the average V•O2maxbe in 60-year-olds who have been sedentary throughout theirlives and in 60-year-olds who have stayed active (keep in mindthat the decline is exponential)?arrow_forwardIf the output is 24 mR / hour at 40 mAs, at 40 inches, what would the dose be per hour for 20 mAs (give answer in R)?arrow_forward✓ ON "O 2.75 MeV 0.511 MeV 0.511 MeV B, E= 1.73 MeV Eave = 0.721 Mev O MeVarrow_forward
- Ann analysed mercury content on a canned fish and the permissible limit of mercury in fish is 0.1 ppm. In this study, an average of 11.4 ± 2.1 ng/g was obtained based on six sample replicates. Suggest a suitable analytical instrument to be used in this analysis and draw a conclusion on the safety of mercury content of this canned tuna.arrow_forwardThe (effective) dose to a patient can be measured in milli-Serverts (mSv) or expressed as the time taken to receive the equivalent dose from background radiation. A certain radiograph gives a 1.232 mSv dose which is equivalent to a background radiation dose of 32 weeks.a)How many days in 32 weeks? Give your answer as a whole number. b)Using the information for the radiograph in this question, calculate the UK daily background dose (in mSv/day). Give your answer to 5 decimal places and use it to this accuracy, if needed in subsequent calculations. c)Another radiograph has a 0.0054 mSv dose. Work out the equivalent background dose (in days) for this radiograph. Give your answer to 2 decimal places and use it to this accuracy in any subsequent calculations. d)How many hours is the number of days in part c) equivalent to? Give your answer to 2 decimal places.arrow_forwardHelp!arrow_forward
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